You'll need to clean/clear all cookies and cache just to be safe. Especially with Google, they have a number of measures in place to prevent "abuse". You can usually make a 3 or 4 accounts off a good IP and then Google will start asking for phone verification. You might be able to try something like creating 2 accounts per IP/proxy, then cleaning and clearing all cookies, then use another proxy. Rinse and repeat basically until you've accomplished what you need to. There's no guarantee it will work, but if you don't clear any cookies and cache I guarantee it will NOT work, so you're definitely better trying to do whatever you can to avoid that.

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